Some people may not know the difference between emmc and SSD. This chart may explain:

We can see that SSD is really 10 times faster than emmc, i.e. 6GB DDR4 + 128GB mSATA SSD is the one we love much more as it is just $40 higher in price.
In connection ports, Beelink Gemini X45 mainly include 4* USB 3.0 and 2* HDMI ports, no need to mention power and LAN here. Some models of mini PCs have type-C, but many people reflect that it is no use at all, and dual HDMI ports are preferred.

As a business class mini PC, Beelink Gemini X45 sopprts Expandable HDD + SSD, which brings much space in capacity.